U.S. patent number 4,295,697 [Application Number 06/117,405] was granted by the patent office on 1981-10-20 for electrical power distribution system principally for space-dividing panels in office buildings.
This patent grant is currently assigned to Owens-Corning Fiberglas Corporation. Invention is credited to Paul R. Grime.
United States Patent |
4,295,697 |
Grime |
October 20, 1981 |
Electrical power distribution system principally for space-dividing
panels in office buildings
Abstract
An electrial power distribution block is secured to the lower
portion of the metal frame of each space-dividing panel. The
distribution blocks in an assembly of panels are electrically
connected together. Wherever access to electical power on either
side of a panel is desired, a slide-in duplex receptacle is mounted
on the distribution block on that side. The receptacles interlock
with the blocks to provide built-in stress relief, without separate
mechanical fasteners, against forces generated by plugging into or
removing a plug from the receptacle. The terminals of the blocks
are recessed and the receptacle terminals which connect with the
block terminals are shielded in plastic sleeve portions of the
receptacles. The conductors of both the blocks and the receptacles
are molded in place.
Inventors: |
Grime; Paul R. (Erie, MI) |
Assignee: |
Owens-Corning Fiberglas
Corporation (Toledo, OH)
|
Family
ID: |
22372746 |
Appl.
No.: |
06/117,405 |
Filed: |
January 31, 1980 |
Current U.S.
Class: |
439/215 |
Current CPC
Class: |
E04B
2/7425 (20130101); H02G 3/288 (20130101); E04B
2002/7488 (20130101) |
Current International
Class: |
E04B
2/74 (20060101); H02G 003/28 () |
Field of
Search: |
;339/20,21R,21S,22R,22B,22T,23,24,65,66R,66M,66T,156-159,205 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: McGlynn; Joseph H.
Assistant Examiner: McKenzie, Jr.; Frank H.
Attorney, Agent or Firm: Hudgens; Ronald C. Cloutier; Philip
R. Rose; Paul J.
Claims
I claim:
1. An electrical power distribution kit comprising an elongated
molded plastic electrical power distribution block having
electrically conductive members molded therein, the conductive
members of the block having terminals accessible respectively from
opposite ends of the block, and an elongated molded plastic
slide-in duplex receptacle having electrically conductive members
molded therein, each of the block and receptacle members having
aligning and interlocking means thereon cooperable with aligning
and interlocking means on the other, the receptacle being
fastenable to the block by sliding the receptacle in the direction
of its length along one side of the block in the direction of the
length of the block and thereby engaging the cooperable aligning
and interlocking means with each other, the receptacle being
engaged with a portion of one end of the block and with the one
side of the block when fastened thereto, the conductive members of
the receptacle having terminals cooperatively engageable
respectively with terminals of the conductive members of the block
adjacent the one end thereof as the receptacle is fastened to the
block by engagement of the cooperable aligning and interlocking
means with each other, the terminals of the conductive members of
the block being recessed within the block respectively in recesses
therein, the terminals of the conductive members of the receptacle
respectively being shielded by plastic sleeve portions of the
receptacle, the plastic sleeve portions being receivable
respectively in recesses of the block as the terminals of the
conductive members of the receptacle are cooperatively engaged
respectively with terminals of conductive members of the block, the
conductive members of the receptacle also having two sets of socket
terminals accessible from a front face of the receptacle parallel
to the sides of the block when the receptacle and block are
assembled, the two sets of socket terminals being spaced
longitudinally of the receptacle, and the cooperable aligning and
interlocking means being an aligning means when the receptacle is
being fastened to the block and an interlocking means when a
service cord is being pulled out of one of said sets of socket
terminals.
2. An electrical power distribution kit comprising an elongated
molded plastic electrical power distribution block having
electrically conductive members molded therein, the conductive
members of the block having terminals accessible respectively from
opposite ends of the block, and an elongated molded plastic
slide-in duplex receptacle having electrically conductive members
molded therein, each of the block and receptacle members having
aligning and interlocking means thereon cooperable with aligning
and interlocking means on the other, the receptacle being
fastenable to the block by sliding the receptacle in the direction
of its length along a side of the block in the direction of the
length of the block and thereby engaging the cooperable aligning
and interlocking means with each other, the conductive members of
the receptacle having terminals cooperatively engageable
respectively with terminals of the conductive members of the block
adjacent one end thereof as the receptacle is fastened to the block
by engagement of the cooperable aligning and interlocking means
with each other, the conductive members of the receptacle also
having two sets of socket terminals accessible from a front face of
the receptacle parallel to the sides of the block when the
receptacle and block are assembled, the two sets of socket
terminals being spaced longitudinally of the receptacle, and the
cooperable aligning and interlocking means being an aligning means
when the receptacle is being fastened to the block and an
interlocking means when a service cord is being pulled out of one
of said sets of socket terminals.
3. An electrical power distribution kit comprising an elongated
molded plastic electrical power distribution block having
electrically conductive members molded therein, the conductive
members of the block having terminals accessible respectively from
opposite ends of the block, and an elongated molded plastic
slide-in duplex receptacle having electrically conductive members
molded therein, the receptacle being engaged with one side of the
block and with a portion of one end of the block when assembled
therewith, the conductive members of the receptacle having
terminals cooperatively engageable respectively with terminals of
the conductive members of the block adjacent the one end thereof as
the receptacle is assembled with the block by sliding the
receptacle in the direction of its length along the one side of the
block in the direction of the length of the block, the terminals of
the conductive members of the block being recessed within the block
respectively in recesses therein, the terminals of the conductive
members of the receptacle respectively being shielded by plastic
sleeve portions of the receptacle, the plastic sleeve portions
being receivable respectively in recesses of the block as the
terminals of the conductive members of the receptacle are
cooperatively engaged respectively with terminals of conductive
members of the block, the conductive members of the receptacle also
having two sets of sockets terminals accessible from a front face
of the receptacle parallel to the sides of the block when the
receptacle and block are assembled, the two sets of socket
terminals being spaced longitudinally of the receptacle, and the
reception of the plastic sleeve portions of the receptacle in the
recesses of the block aiding in interlocking the receptacle with
the block against forces generated when a service cord is being
pulled out of one of said sets of socket terminals.
4. An electrical power distribution kit as claimed in claim 1, 2,
or 3, wherein the conductive members of the receptacle also have
additional terminals accessible from an end of the receptacle.
5. An electrifiable acoustical office space-dividing panel
comprising an acoustical board, a metal frame around the board, and
an electrical power distribution kit as claimed in claim 1, 2, or
3, the electrical power distribution block being secured to a lower
portion of the frame intermediately of opposite ends thereof.
Description
TECHNICAL FIELD
This invention relates generally to free-standing decorative
acoustical panels for dividing space in office buildings, and more
particularly to an electrical power distribution system for use
therewith.
BACKGROUND ART
The type of office space-dividing panels for which the electrical
power distribution system of this invention is particularly
suitable is shown and described in U.S. Pat. No. 4,158,936. Each
such panel includes a metal frame around the edges of two fibrous
glass boards arranged back-to-back, two supporting legs secured to
the bottom of the frame adjacent opposite ends thereof, and two
elongated base cover plates removably secured to the supporting
legs. The cover plates and the bottom frame portion partially
define an electrical raceway.
DISCLOSURE OF THE INVENTION
An electrical power distribution block is secured by one screw to
the bottom frame portion of each space-dividing panel between the
supporting legs. The distribution block of each panel is
electrically connected to those of other panels in an assembly and
an electrical power supply is connected to one of the blocks.
Wherever access to electrical power is desired on either side of a
panel, a slide-in duplex receptacle is mounted on the distribution
block of the panel on that side, and the base cover plate is
provided with an access aperture.
Both the power distribution blocks and the slide-in duplex
receptacles are made of molded plastic with the electrical
conductors molded in place and terminal portions recessed, and
further, the molded portions of the distribution blocks and
receptacles are matched so as to interlock when assembled and
provide built-in stress relief, without separate mechanical
fasteners, against forces generated by plugging into or removing a
plug from the receptacle.
BRIEF DESCRIPTION OF THE DRAWINGS
The details of the invention are set forth in connection with the
accompanying drawings in which:
FIG. 1 is a reduced exploded isometric view of a power distribution
block and a pair of slide-in duplex receptacles constructed in
accordance with the invention, along with a portion of a power
distribution cord;
FIG. 2 is an exploded reduced plan view of the articles of FIG.
1;
FIG. 3 is a reduced plan view of the articles of FIG. 2 in
assembled relationship;
FIG. 4 is a front view of one of the slide-in duplex receptacles
with the cover plate removed, taken in the direction of arrows 4--4
of FIG. 2;
FIG. 5 is an end view of the power distribution blocked with a pair
of the slide-in duplex receptacles assembled thereto, taken in the
direction of arrows 5--5 of FIG. 3, portions of one of the
receptacles being broken away;
FIG. 6 is a vertical sectional view of the power distribution
block, taken along the line 6--6 of FIG. 2;
FIG. 7 is a plan sectional view of the power distribution block,
taken along the line 7--7 of FIG. 6;
FIG. 8 is a reduced longitudinal sectional view of one of the
slide-in duplex receptacles, taken generally along the line 8--8 of
FIG. 4;
FIG. 9 is a reduced longitudinal sectional view of one of the
slide-in duplex receptacles, taken generally along the line 9--9 of
FIG. 4;
FIG. 10 is a reduced sectional view taken generally along the line
10--10 of FIG. 2;
FIG. 11 is a reduced outer end view of one of the slide-in duplex
receptacles, showing how the left-hand receptacle of FIG. 5 appears
without portions broken away;
FIG. 12 is a reduced fragmentary elevational view of an office
space-dividing panel having a distribution power block and a pair
of slide-in duplex receptacles constructed in accordance with the
invention mounted thereon;
FIG. 13 is a fragmentary sectional view taken generally along the
line 13--13 of FIG. 12; and
FIG. 14 is a reduced schematic plan view of an assembly of a
plurality of space-dividing panels each having a power distribution
block constructed in accordance with the invention mounted on the
bottom portion of the frame thereof and none, one, or two slide-in
duplex receptacles assembled on the distribution block.
BEST MODE FOR CARRYING OUT THE INVENTION
With respect to the drawings, an electrical power distribution
block 20 constructed in accordance with the invention is shown in
FIGS. 1, 2, 3, and 5. As best shown in FIG. 1, the distribution
block 20 includes a generally H-shaped plastic mounting spacer
portion 21a molded integrally with a generally rectangular plastic
block portion 21b. The block portion 21b is molded around four
electrically conductive flat metallic members 23, 24, 25, and 26
shown in FIGS. 5-7. The conductive member 24 (FIG. 7) includes two
elongated, parallel, spaced portions 24a each having a pair of male
spade terminals 24b respectively at opposite ends. Each terminal
24b of one elongated portion 24a is connected adjacent an inner end
to a corresponding terminal 24b of the other elongated portion 24a
by a connecting portion 24c. The conductive members 23, 25, and 26
are similarly constructed, except that the conductive member 24
also has an additional apertured central connecting portion 24d
connecting the two elongated portions 24a centrally thereof.
The member 24 is the ground for a grounded electrical system. A
screw 28 fragmentarily shown in FIG. 6 is used to secure the
distribution block 20 to the bottom of the metal frame 30 (FIG. 13)
of a space-dividing acoustical panel 29 (FIG. 12). The head of the
screw 28 bears against the conductive member 24.
The block portion 21b is provided with eight recesses at each end,
as best shown for one end in FIG. 1, for providing access to the
terminals of the conductive members 23, 24, 25, and 26, such as the
terminals 24b, which are recessed within the block portion.
Two slide-in duplex receptacles 32 constructed in accordance with
the invention are shown in FIGS. 1-3. Each receptacle 32 includes a
molded plastic casing 33 and a snap-on molded plastic cover 34.
Each cover 34 has four rectangularly spaced prongs 34a. As will be
understood by those skilled in the art, the prongs 34a are somewhat
flexible and have cam surfaces on transversely outwardly enlarged
free end portions, the cam surfaces being engageable with an inner
edge of the respective casing 33 as the cover 34 is applied, and
flexing the prongs 34a inwardly. Further, each casing 33 is
provided with a pair of apertures 33a in each of a pair of opposed
wall portions, and the enlarged free end portions of the prongs 34a
snap into the respective apertures 33a as the cover is assembled to
the casing. Thereafter it is very difficult to remove the cover 34
without forced breaking of the prongs 34a.
Each cover 34 is provided with suitable apertures for receiving the
prongs of two three-prong electrical plugs. Further, each casing 33
contains suitable female terminals aligned with the apertures in
the cover 34 for receiving the prongs of two electrical plugs.
Thus, as shown in FIG. 4, each casing 33 contains two female ground
terminals 36 for respectively receiving the ground prongs of two
electrical plugs, two female power terminals 37 for respectively
receiving one power prong of each of the two electrical plugs, and
two female power terminals 38 for respectively receiving the other
power prong of each of the two electrical plugs.
FIG. 9 shows the two ground terminals 36 formed integrally with a
connecting strap 36a molded into the casing 33. A wire 42 is
crimped at one end to the strap 36a and at the other end to a blade
44 molded into another portion of the casing 33 and having a female
spade terminal 44a at one end and a male spade terminal 44b at the
other end.
FIG. 8 shows the two power terminals 37 formed integrally with a
connecting strap 37a molded into the casing 33. A wire 48 is
crimped at one end to the strap 37a and at the other end to a blade
50 molded into another portion of the casing 33 and having a female
spade terminal 50a at one end and a male space terminal 50b at the
other end.
The two power terminals 38 are also formed integrally with a
connecting strap (not shown) joined by a wire (not shown) to a
blade 52 (FIG. 10) having a female spade terminal 52a at one end
and a male spade terminal 52b at the other end. A fourth blade 54
having a female spade terminal 54a at one end and a male spade
terminal 54b at the other end is molded into the casing 33 to
provide a straight current path therethrough and is not
electrically connected to anything within the casing.
As will be understood by those skilled in the art, other slide-in
duplex receptacles will have a set of the power terminals 37 or 38
electrically connected to the blade 54 and no power terminals
connected to the blade 50. Thus the distribution blocks 20 may be
part of a 230-volt system and the two different types of
construction for the slide-in duplex receptacles will allow
balanced 115-volt loads.
The terminals 36, 37, and 38, the connecting straps such as straps
36a and 37a, the wires such as wires 42 and 48, and the blades 44,
50, 52, and 54 are molded in place into the molded plastic casing
33. The male spade terminals 44b, 50b, 52b, and 54b are recessed
within the casing 33 and the casing is provided with recesses
therearound for providing access thereto. The female spade
terminals 44a, 50a, 52a, and 54a are shielded by plastic sleeves
integral with the casing 33.
Because of the different constructions of receptacles 32 with
respect to which of the power terminals 37 and 38 are connected to
the blades 50, 52, and 54, as explained above, provision is made
for preventing installation of a receptacle 32 upside down with
respect to a distribution block 20, and at the same time for
providing interlocking between the distribution block 20 and the
receptacle 32 for built-in stress relief against the forces of
plugging and unplugging electrical service cords into the
receptacle 32. The block portion 21b includes interfering portions
21c (FIGS. 1, 5, and 7) respectively in the recesses for the ground
terminals 24b, and the plastic sleeve around the female terminal
44a of each receptacle 32 is correspondingly cut away, as at 33b in
FIG. 1, to accommodate the respective interfering portion 21c. If
the receptacle is turned upside down with respect to the
distribution block 20 and attempted to be assembled therewith, the
sleeve around the female terminal 52a would interfere with the
respective interfering portion 21c.
Also preventing upside-down assembly and additionally enabling
interlocking of the block 20 and a receptacle 32 are L-shaped
projections 21d on the mounting spacer portion 21a, a groove 33c on
each casing 33 for receiving the free end portion of the respective
projection 21d, base leg portions 21e on the block portion 21b, and
an L-shaped projection 33d on each receptacle 32 for wrapping
around the respective base leg portion 21e. FIGS. 1 and 2 show two
receptacles 32 (i.e., casings 33 thereof) about to be assembled
with the distribution block 20 and FIG. 3 shows them assembled.
FIG. 5 shows how the receptacles 32 interlock with the block 20 to
provide built-in stress relief against forces of plugging or
unplugging electrical service cords into or out of the receptacles
32, without the necessity of screw-type fastners. The free end
portions of the L-shaped projections 21d are received respectively
in the grooves 33c and the L-shaped projections 33d are wrapped
respectively around two of the base leg portions 21e. The casing 33
also has an interfering portion 33e.
FIG. 1 also shows an electrical cord 56 having a plug 58 which can
be plugged into either the distribution block 20 or into an end of
a receptacle 32 having the male terminals 44b, 50b, 52b, and 54b.
The plug 58 has corresponding female terminals shrouded in plastic
sleeves. FIG. 2 shows two of the electrical cords 56 about to be
plugged into the block 20, and FIG. 3 shows two cords 56 plugged
into the block 20 and one cord 56 plugged into one of the
receptacles 32.
FIG. 13 shows one of the distribution blocks 20 installed in a
panel 29 along with two of the slide-in duplex receptacles 32. The
panel 29 is generally like that disclosed in U.S. Pat. No.
4,158,936, the support legs to which base side panels 31 are
secured not being shown herein.
When a cord 56 is used to connect a distribution block 20 in one
panel 29 with block 20 in another panel, it has plugs 58 on both
ends. FIG. 14 shows a plurality of assembled panels 29 with blocks
20, receptacles 32, and cords 56 schematically shown therein. A
distribution block 20 is present in each panel 29, but there may be
none, one, or two slide-in duplex receptacles 32 in each panel. A
power supply cord 60 for the several panels 29 has a plug 58 on
only one end. When the panels 29 are assembled in a T-shape plan,
one cord 56 is connected to a distribution block 20 and one may be
connected to a receptacle 32 to feed two branches of the T-shape,
respectively.
Various modifications may be made in the structure shown and
described without departing from the spirit and scope of the
invention.
* * * * *